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breakout.html
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<html>
<head>
<meta name='viewport' content='width=660 user-scalable=no'>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
</head>
<body bgcolor='grey'>
<center>
<font color='white'>
<canvas id='leinwand' width='640' height='960' style='border:1px solid white; margin:0pt' ontouchstart="touchstart(event)"
ontouchmove="touchmove(event)"
ontouchend="touchend(event)"
onmousedown="touchstart(event)"
onmousemove="touchmove(event)"
onmouseup="touchend(event)">
</canvas>
<br><br>
Steuerung: Pfeiltasten links/rechts<br>
oder Berührung linke/rechte Bildhälfte
</font>
</center>
<script type='text/javascript'>
document.onkeypress = keypress;
document.onkeydown = keypress;
document.onkeyup = keyup;
var canvas = document.getElementById('leinwand');
var ctx = canvas.getContext('2d');
var SCR_W = 640;
var SCR_H = 960;
var ballx = 320;
var bally = SCR_H - 64;
var ballxdir = 5.0;
var ballydir = -10.0;
var playerx = SCR_W / 2;
var playery = SCR_H - 40;
var PLAYER_SPEED = 10.0;
var playerw = 80;
var playerh = 20;
var playerxdir = 0.0;
var finished = false;
var bricks = [[0, 0, 1, 1, 1, 1, 0, 0],
[0, 1, 0, 1, 1, 0, 1, 0],
[0, 1, 0, 1, 1, 0, 1, 0],
[0, 1, 1, 1, 1, 1, 1, 0],
[1, 1, 1, 1, 1, 1, 1, 1],
[1, 0, 1, 1, 1, 1, 0, 1],
[1, 1, 0, 0, 0, 0, 1, 1],
[0, 1, 1, 1, 1, 1, 1, 0],
];
function update()
{
// Bild loeschen
ctx.fillStyle = "black";
ctx.fillRect(0, 0, SCR_W, SCR_H);
// Kreis zeichnen
ctx.beginPath();
ctx.arc(ballx, bally, 8, 0, 2 * Math.PI);
ctx.fillStyle = "white";
ctx.fill();
ctx.strokeStyle = "grey";
ctx.stroke();
// Schlaeger zeichnen
ctx.fillStyle = "white";
ctx.fillRect(playerx - playerw/2, playery - playerh/2, playerw, playerh);
// Bricks zeichnen
ctx.fillStyle = "green";
for(y=0; y<8; y++)
for(x=0; x<8; x++)
if (bricks[y][x] == 1)
ctx.fillRect(x * SCR_W / 8,
y * SCR_H / 2 / 8,
SCR_W / 8 -2,
SCR_H / 2/ 8 -2);
// Schlaeger bewegen
playerx += playerxdir;
// Schlaegerkollision mit Rand
if (playerx <= playerw/2)
if (playerxdir < 0)
playerx = playerw/2;
if (playerx >= SCR_W - playerw/2)
if (playerxdir > 0)
playerx = SCR_W - playerw/2;
// Kollision zwischen Schlaeger und Ball
if (bally >= playery - 8 && bally <= playery + 8)
{
//ctx.fillStyle = "red";
//ctx.fillRect(0, playery - 8, SCR_W, SCR_H);
if (ballx >= playerx - playerw/2 && ballx <= playerx + playerw/2)
{
ballydir *= -1;
ballxdir += playerxdir * 0.1;
}
}
// Ball bewegen x
ballx += ballxdir;
// Kollision zwischen Ball und Steinen
testx = Math.floor(ballx / (SCR_W / 8));
testy = Math.floor(bally / (SCR_H / 2 / 8));
if (testx < 8 && testy < 8)
{
if (bricks[testy][testx] == 1)
{
bricks[testy][testx] = 0;
ballxdir *= -1;
}
}
// Ball bewegen y
bally += ballydir;
// Kollision zwischen Ball und Steinen
testx = Math.floor(ballx / (SCR_W / 8));
testy = Math.floor(bally / (SCR_H / 2 / 8));
if (testx < 8 && testy < 8)
{
if (bricks[testy][testx] == 1)
{
bricks[testy][testx] = 0;
ballydir *= -1;
}
}
// Ballkollision mit Rand
if (ballx <= 8 || ballx >= SCR_W -8)
ballxdir *= -1;
if (bally <= 8)
ballydir *= -1;
// Ball flog unten raus
if (! finished)
{
if (bally >= SCR_H)
{
ctx.font = "bold 36px Arial";
ctx.textAlign = "center";
ctx.fillStyle = "#FFFFFF";
ctx.fillText("GAME OVER", SCR_W / 2, SCR_H / 2);
ctx.font = "bold 18px Arial";
ctx.fillText("please refresh page", SCR_W / 2, SCR_H / 2 + 40);
}
}
// ermitteln ob Level geschafft wurde
finished = true;
for(y=0; y<8; y++)
for(x=0; x<8; x++)
if (bricks[y][x] == 1)
finished = false;
if (finished)
{
ctx.font = "bold 36px Arial";
ctx.textAlign = "center";
ctx.fillStyle = "#FFFFFF";
ctx.fillText("CONGRATULATIONS", SCR_W / 2, SCR_H / 2);
ctx.font = "bold 18px Arial";
ctx.fillText("please refresh page", SCR_W / 2, SCR_H / 2 + 40);
}
}
function keypress(event)
{
if (event.which == 37) // Pfeil nach links gedrueckt
moveLeft();
if (event.which == 39) // Pfeil nach rechts gedrueckt
moveRight();
}
function keyup(event)
{
if (event.which == 37) // Pfeil nach links losgelassen
stopLeft();
if (event.which == 39) // Pfeil nach rechts losgelassen
stopRight();
}
function moveLeft()
{
playerxdir = -PLAYER_SPEED;
}
function stopLeft()
{
if (playerxdir < 0)
playerxdir = 0;
}
function moveRight()
{
playerxdir = PLAYER_SPEED;
}
function stopRight()
{
if (playerxdir > 0)
playerxdir = 0;
}
function touchstart(event)
{
// canvas-Position ermitteln zwecks Verschiebung
var canvasRect = canvas.getBoundingClientRect();
xoff = canvasRect.left;
yoff = canvasRect.top;
// Touch-Events verarbeiten
for(var i=0; i<event.changedTouches.length; i++)
{
var touch = event.changedTouches[i];
if (touch.clientX - xoff < SCR_W / 2)
moveLeft();
if (touch.clientX - xoff > SCR_W / 2)
moveRight();
}
event.preventDefault();
}
function touchmove(event)
{
touchstart(event);
}
function touchend(event)
{
for(var i=0; i<event.changedTouches.length; i++)
{
var touch = event.changedTouches[i];
if (touch.clientX - xoff < SCR_W / 2)
stopLeft();
if (touch.clientX - xoff > SCR_W / 2)
stopRight();
}
event.preventDefault();
}
setInterval(function(){ update(); }, 25); // die Funktion "update" wird alle 25 Millisekunden aufgerufen
</script>
</body>
</html>